Detailed Product Description Dongbao EMI coating PC lenses can absorb the harmful EM waves produced from computers and other electromic devices.1) The raw material of our PC lenses are all imported 2) Available diameters: 73 mm, 65mm3) Hard coated lens, HMC lens,4) Progtessive PC lens, bifocal lens, tintable lens5) Semi-finished lens is also available